Heat shielded shaker conveyor trough line



June 29, 1965 Filed April 16, 1963 mi I L.. D. HAGENBooK 3,191,763

HEAT SHIELDED SHAKER CONVEYOR TROUGH LINE 2 Sheets-Sheet 1 Q/ o]INVENTOR.

Loy D. Hagenbook ATTYS.

`hline 29, 1965 l L D HAGENBOOK 3,191,763

HEAT SHIELDED SHAKER CONVEYOR TROUGH LINE Filed April 16, 1963 2Sheets-Sheet 2 A "a0 38 77?-7 fg 40 l2\ 40 319 3.9 4.0

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Loy D. Hagenbook AIT YS.

United States Patent 3,191,763 HEAT SEMLDED SHAKER @N WEYR TRU'GH LINEThis invention relates to improvements in shaker conveyor trough linesadapted to transport heavy hot material.

In shaker conveyor trough lines used in steel mills, foundries and likeplaces, for transporting hot heavy abrasive material, the hot materialis usually conveyed along liner troughs for a shaker conveyor troughline, and the high degree of heat of the material conveyed is conductedto the trough line by conduction and radiation. Where 4the material isextremely hot the bottom ofthe underlying trough of the trough line isheated to a much higher temperature than the side walls of the trough.This causes the bottom of the trough to warp with the resultant breakingof the welds and frequent lifting the trough from its guide and :support'rollers by the warping effect of the trough. t

In order to alleviate this problem, the trough line has been providedwith liners in which the bottoms of the liners lare spaced lfrom thebottom of the underlying trough of the trough line to provide an airinsulating space between the bottom of the trough liner troughs and theunderlying trough. Such liners have providedsatisfactory at moderatetemperatures up to about 250 F., where the Only heating of theunderlying trough is by conduction, which is relatively small because ofthe ysmall contact between the underlying trough and the hot liner.Where the ternperature of the material conveyed, however, issubstantially above 250 F. and in the range of 500 F. and over, thebottom of the underlying trough in addition to being heated by.conduction is also heated by radiation, causing the underlying troughbottom to become much hotter than its side Walls with the result warpingof the trough bottom.

A principal object of the present invention is to overcome the foregoingproblems by utilizing a heat shield between the bottom of the linertrough and the underlying .trough and radiating the heat waves receivedfrom the adjacent surface of the liner trough in all directions, andreturning part of the heat to the lsource and passing on the remainingheat to the bottom trough section, with a substantial `reduction in theheat passed on.

Another object of the invention is to provide `an irnproved form ofshaker conveyor trough line for conveying hot material which may beabrasive, having a liner trough secured :to the sides of an underlyingtrough section, with its bottom` spaced -above the bottom of theunderlying trough section in which-a heat shield extends along the spacebetween the trough section and lreduces the radiation of heat to theunderlying trough section in stages.

A further object of the invention is to provide .a simplied and improvedmeans for preventing warping of the bottom of a shaker conveyor troughline for conveying hot abrasive material by utilizing a liner for thetrough section, carrying the hot abrasive material `and by providing' atleast two layers of thin heat radiating material in the space betweenthe bottom of the conveyor trough `section and its line-r.

A still further object of the invention is to provide an improved formof shaker conveyor trough line for carrying hot material, in which laliner trough extends along and is spaced above the top surface of thebottom of an underlying trough of the trough line, `and in which -a heatshield is placed between the liner trough and the underlying 34,191,763Patented June 29, 1965 'ice trough and is in the form of at least twolayers of thin heat radiating material spaced from one another and fromthe troughs.

A still further object of the invention is to provide an improved forrnof shaker conveyor trough for conveying hot abrasive materials in whicha liner trough is nested within an underiying trough and spaced from thetop surface of the bottom thereof and a plurality of thin heat barriermetal sheets tof dimpled material arespaced between the top surface ofthe bottom of the underlying trough and the liner trough and spaced fromeach other by the dimpled portion thereof, to radiate the heat trom theliner trough in all directions and return part of the heat to the sourceand pass the remaining heat onto the bottom trough, with a .substantialheat reduction at each stage of radiation. y

These and other objects of the invention will lappear from time to timeas the following specification proceeds and with reference to theaccompanying drawings wherein:

FIGURE 1 is a lfragmentary top plan view lof a portion of a shakerconveyor trough line constructed in accordance with the principles ofthe present invention, with part of the liner trough broken away inorder to show certain details of the heat shield between the line-rtrough and main trough of the trough line;

FIGURE 2 is a transverseisectional tially along line II-II of FIGURE 1;

FIGURE 3 is an enlarged partial -fragrnentary longitudinal sectionalview taken along a portion of the liner and underlying troughs;

FIGURE 4 is a plan view of a form of heat shield member that may be usedto carry out the invention; and

FIGURE 5 is a view in side elevation of the heat shield member shown inFIGURE 4.

In the embodiment of the invention illustrated in the drawings, I haveshown in FIGURE 1 a portion of a shaker conveyor pan or trough line 10.The trough line 10 includes an underlying trough 11, which may extendfor the length of the trough line and take the impact forces `of theshaker conveyor. A plurality of liner pans or troughs 12, 12 `are shownas being nested within .the underlying trough 11 and connected thereto.

The underlying trough 11 may be reciprocably driven by a conventionalshaker conveyor drive mechanism, (not shown) to eiiect the movement ofmaterial along the trough line in the direction of the arrowV shown inFIG- URE 1. The underlying trough bottom 13 having inclined side walls15, 15 haring outwardly and upwardly from opposite .sides of said bottomand terminating into parallel |upright connector flanges 16, 16,extending for the length of said underlying trough.

The underlying trough 1l is mounted on a series of spaced rollersupports i7, 17, spaced at suitable intervals along the trough 1l. Theroller supports 17, 17 include aligned laterally spaced rollers 18, 18mounted for rotatable movement about axes extending transversely of thetrough line and engaged by wear strips 19, 19 extending along thebottoms of angle retainers 20, 20. The angle retainers 2t), 2d havevertical legs spaced outwardly of the rollers 18, iS and serving toretain the underlying trough 11 to said rollers. The angle retainers 26,20 extend along the bottom of a cross plate 23, supporting theunderlying trough 11, and extending across and along the bottom of saidtrough for a portion of the length thereof. As shown in FIGURE 2, theangle brackets 24, 24 have engagement with the inclined side walls 15,15 of the underlying trough 11 on their vertical` legs and are welded orotherwise secured thereto. The horizontal legs of the angle brackets 24,24 abut the top surface of the cross plate 23, and are shown as beingbolted thereto, as by nuts and bolts 25.

view taken-substan- 11 has a relatively flat t The underlying trough 11also has a plurality of spacer lugs 27,27 spaced along the bottomthereof and projecting upwardly therefrom and forming a support forbottoms 29 of the receiving end portions of the overlapped liner troughs12. The spacer lugs 27 are located at the overlapping joints between theliner troughs and provide an air space between the underlying trough 11and the bottoms of theliner troughs 12. Y

Each liner trough 12 has outwardly flaring side walls 30, 30 flaringoutwardly from the bottom 29 and gen-` erally conforming to the flaredside walls 15, 15 of the underlying trough 11V. The flared side walls30, 30 terminate at their upper ends into upright flanges 31, 31generally conforming to the flanges 16, 16 and forming connector flangesfor the liner trough 12. The liner troughs 12 also slightly convergefrom their receiving to their discharge ends to accommodatetthedischarge end of one liner trough to be nested within the receiving endof the next adjacent liner trough. l

The connectors for connecting the liner` troughs 12 to the underlyingtrough 11 are shown as being inthe form of a series of downwardly facingU-shaped clipsV 33 extending over the tops of the connector ilanges 16and 31, and downwardly along said ilanges. As shown in FIG- URES 1 and2, the clips 33 extend downwardly along the outer sides of the ilanges16 of the underlying trough and downwardly along the inner sides of theanges 31 of the nested or overlapping liner trough, and have noconnection with the adjacent end of the` underlapped liner trough. Thisaccommodates longitudinal expansion and contraction of the underlappedtrough with respect to the overlapped trough. The clips 33 may besecured to the associated connector flanges 16 and 31 as by welding, orby any other suitable form of connecting means.

Thespace between the bottoms ofthe liner troughs 12 and the top surfaceof the bottom of the underlying trough 11 contains a heat shield 37,shown as being in the form of a plurality of longitudinally alignedkheat barriersv 38. Each heat barrier comprises a plurality of stackedthin heat` barrier sheets 39, which may be made from steel or any othersuitable material having heat radiating characteristics.

Asshown in FIGURE 3, each heat barrier 38 has three heat barrier sheets39 in the space between the under* lying troughj and the linertrough,vand each one of these sheets is dimpled as indicated byreference character 40. The dimpled portions 4Q open `upwardly to formdownward projections 41, projecting downwardly from the sheets 39Vtospace the sheets 39 apart, and to space the bottomV sheets above the topsurface of the bottom of the underlying trough 11. i

The dimples are uniformly spaced along the sheets, butv the sheets arelongitudinally staggered `with respect to :ach other to stagger thedimples of the various sheets and to thereby assure that the downwardlyprojecting por ions 41 of said dimples will rest on a plane surface and:pace the sheets apart.

As shown in FIGURES 4 and 5, the heat barrier sheets tre depressedintermediate the ends thereof, along lines :xtending transverselythereof and are Welded together y bead welds extending thereacross andindicatedV genr`ally by reference character 42. The heat barrier sheetsi9 being sandwiched and welded together as shown in FIGURES 4 and 5,with each heat barrier sheet` spaced 1 advance of the next lower heatbarrier sheet, are then laced along the top surface of the bottom 13.0fthe nderlying trough 11 in lapping relation with respect to ach otherand are spot welded to the top surface of the ottorn of the trough 11along opposite sides thereof, at 1e lower portions of the llared sidewalls 15 of the trough s indicated by reference character 43 in FIGURESl 1d 2.

It should here be understood Ythat the heat barrier leets 39are paperthin and a lower heat barrier sheet ill generally conform to theinclination of the flared side wall 15 along its opposite sides andadjacent the lower margins of said side walls, at their juncture withthe bottom'13 and the next adjacent upper and top heat barrier will bepressed downwardly at the spot welds and for the length of the heatbarrier.

The heat shield 37 formed by the sandwiched heat barrier Sheets isprovided with rectangular openings 45 therein to accommodate the spacerlugs 27 to pass therethrough.

While I have herein shown the heat shield 37 as being formed from threesandwiched heat barrier sheets, it should be understood that the numberof sheets may be varied in accordance with the requirements necessary toshield the bottom 13 of the underlying trough 11 from radiant heat.Where the material conveyed is at a red heat, two heat barrier sheetsare all that are usually required to radiate the heat and maintain thetemperatures of the side walls 15 at substantially the temperature ofthe bottom 13. Where, however, the material conveyed is so hot as to beincandescent, a heat shield having three heat barriersheets has beenfound sufficient to hold down the heating of the bottom underlyingtrough so its temperature is at generally the same level as thetemperature of the side walls of the trough. Where the material conveyedis at such temperatures, and the heat barrier is made up of three heatbarrier sheets, no warping has occurred in the underlying trough.

Where, however, a heat barrier has not been used, the differentialV intemperature of the underlying trough bottorn as compared with its sidewalls may be in excess of F., with the result that the underlying troughhasl warped so badly as to `break its welds and cause the trough to liftfrom itsy guide and support rollers, with a resultant breakdown in theconveyor.

It should be further understood that lthe heat shield serves to shieldthe bottom 13 of the underlying trough 11 from radiant heat land that indoing this each heat barrier sheet receives the heat waves from anadjacent surface and radiates the heat waves in .all directions,returning part of the heat to the source and passing the remaining partof the heat onto the next surface, with a Asubstantial heat reduction ateach stage. n

While I have herein shown and described one form in which my inventionmay -be embodied, it should be understood that various variations andmodications in the invention may lbe attained without departing from thespirit and scope of the novel concepts thereof.

I claim as my invention:

1 AIn a shaker rconveyor trough line, an underlying trough extending forthe length of the trough line, a liner troughnested within and having abottom spacedl above the top surface of the bottom of said underlyingtrough, a heat shield between said liner trough and said underlyingtrou-gh, said heat shield comprising a layer of thin heat radiatingsheet material extending along and spacedbetween the bottom of saidIliner trough and the top surface ofthe bottom of said underlyingtrough.

2. In a shaker conveyor trough line, an underlying trough extending forthe length of the trough line,Y ya liner trough nested within and havinga bottom spaced above .the top surface of the bottom of said underlyingtrough, a heat shield between said liner trough and said underlyingtrough, said heat shield comprising a plurality of layers of thin heatradiating sheets havin-g dimples therein forming projections projectingfrom said Isheets Vand generally spacing said sheets from one anotherand from the top surfacek of the bottom of said underlying trough.

3. In a shaker conveyor trough line, an underlying trough extending forthe length of the trough line, a liner trough nested within and having abottom spaced above the top surface of the bottom of said underlyingtrough, a heat shield between said liner trough and said underlyingtrough, said heat shield comprising at least two layers of paper thinsteel sheets having dimples opening at the top sides thereof and formingdownwardly projecting proensures jections, generally spacing said sheetsfrom lone another and from said underlying trough.

4. A shaker conveyor trough for conveying hot abrasive materialcomprising an underlying trough, a liner trough nested Within and havinga bottom spaced above the top surface of the bottom of said underlyingtrough, and means maintaining the temperature of the bottom of saidunderlying trough at substantially the temperature of the side walls ofsaid trough upon the conveying of hot material along said liner trough,comprising a heat shield between said liner trough and said underlyingtrough, said heat shield comprising at least two layers of thin heatradiating sheet material generally spaced from one another and from saidtroughs.

5. A shaker conveyor trough for conveying hot abrasive material,comprising .an underlying trough having a bottom and side wallsextending upwardly therefrom, a liner trough nested within saidunderlying trough and extending therealong and having a bottom spacedabove the top surface of the bottom of said underlying trough, and meansmaintaining the temperature of the bottom of said underlying trough atsubstantially the ltemperature of the side walls of said underlyingtrough upon the conveying of hot abrasive material along said linertrough, comprising a heat shield extending along the top surface of thebottom of said underlying trough and spaced beneath the bottom of saidliner trou-gh and comprising a plurality of layers of thin lheatradiating material generally spaced from each other and from saidtroughs, and means securing said heat shield to said underlying troughalong the longitudinal margins of said heat shield.

6. A shaker conveyor trough for -conveying hot abr-asive materialcomprising :an underlying trough having a bottom and side wallsextending upwardly therefrom and along opposite sides thereof, a linertrough nested in and having .a bottom spaced above the top surface ofthe bottom of said underlying trough and extending therealong, and meansmaintaining the temperature of the bottom of said underlying trough atsubstantially the temperature of the side walls of said trough upon theconveying of hot material along side liner trough comprising a heatshield between lthe bottom of said liner trough and the top surface ofthe bottom of said underlying trough and comprising a plurality oflayers of thin heat radiating sheet material, each sheet having dimplesformed therein forming projecting portions projecting from the bottomthereof and generally spacing said layers from each other and from thetop surface of the bottom of said underlying trough.

7. A shaker conveyor trough for conveying hot abrasive materialcomprising an underlying trou-gh having a bottom and side wallsextending upwardly therefrom and along opposite sides thereof, a linertrough nested in and having a bottom spaced above the bottom of saidunderlying trough and extending therealong, and means maintaining -thetemperature of the bottom of said underlying trough at substantially thetemperature of the side walls of said trough upon the conveying of hotmaterial along said liner trough comprising a heat shield between thebottorn of said liner trough and the top surface of the bottom of saidunderlying trough and `comprising a .plurality of layers of thin heatradi-ating sheet material, eaoh having dimples formed therein lformingprojecting portions projecting from the bottom thereof and generallyspacing said layers from each other and lfrom the top surface of thebottom of said underlying trough, welding means securing said layerstogether at longitudinally spaced points, and other welding meanssecuring said layers to the top surface of the bottom of said underlyingtrough along the longitudinal margins of said heat shield.

S. In a shaker conveyor trough line, an underlying trough extending forthe length of the trough line, a plu- `rality of liner troughs extendingalong said underlying trough and nested therein, each liner troughhaving a discharge end overlapping the receiving end of the nextadjacent liner trough, means securing the overlapping discharge endportion of each liner trough to said underlying trough, a heat shieldmaintaining the bottom of said underlying trough at substantially thetemperature of the side walls of said trough upon the conveying of hotmaterials along said liner trough, said heat shield comprising aplurality of longitudinally aligned heat barriers extending for thelength of said underlying trough in the space beneath the bottom of saidliner trough, each heat barrier comprising at least two layers of thinheat radiating heat barrier sheets generally spaced from each other andfrom said troughs and extending in generally end to end relation withrespect to each other.

9. ln a shaker conveyor trough line, an underlying trough extending forthe length of the trough line, a plurality of liner troughs extendingalong said underlying trough and nested therein, each liner troughhaving a discharge end overlapping the receiving end of the nextadjacent liner trough, means securing the overlapping discharge endportion of each liner trough to said underlying trough, a heat shieldmaintaining the bottom of said underlying trough at substantially thetemperature of the side Walls of said trough upon the conveying of hotmaterials along said liner trough, said heat shield comprising aplurality of longitudinally aligned heat barriers extending for thelength of said underlying trough in the space beneath the bottom of saidliner trough, each heat barrier comprising a plurality of layers of thinheat radiating heat barrier sheets, each sheet having dimples formedtherein forming projections projecting from one side of said sheet, andsaid projections of each sheet being spaced from the dimples ofthe nextadjacent sheet to maintain an air space between said sheets and betweenthe bottom of the lower of said sheets and the top surface of the bottomof said underlying trough, and means retaining said heat barriers to thetop surface of the bottom of said underlying trough in generally end toend relation with respect to each other.

itl. In a shaker conveyor trough line, an underlying trough extendingfor the length of the trough line, a plurality of liner troughsextending along said underlying trough and nested therein, each linertrough having a discharge end overlapping the receiving end of the nextadjacent liner trough, means securing the overlapping discharge endportion of each liner trough to said underlying trough, a heat shieldmaintaining the bottom of said underlying trough at substantially thetemperature of the side walls of said trough upon the conveying of hotmaterials along said liner trough, said heat shield comprising aplurality of longitudinally aligned heat barriers extending for thelength of said underlying trough in the space beneath the bottom of saidliner trough, each heat barrier comprising a plurality of layers of thinheat radiating heat barrier sheets, each sheet having uniformly spaceddimples formed therein forming projections projecting from the bottomsthereof and generally spacing said sheets apart and from the top surfaceof the bottom of said underlying trough, each upper sheet beinglongitudinally offset in advance of the next adjacent lower sheet toposition the projecting portions of the dimples to engage the planesurfaces of said sheets, and means welding said sheets together atspaced apart points and to the top surface of the bottom of saidunderlying trough along the longitudinal margins of said sheets.

1.1. In a shaker conveyor trough line, an underlying trough extendingfor the length of the trough line, a plurality of liner troughsextending along said underlying trough and nested therein, each linertrough having a discharge end overlapping the receiving end of the nextadjacent liner trough, means securing the overlapping discharge endportion of each liner trough to said underlying trough, a heat shieldmaintaining the bottom of said underlying trough at substantially thetemperature of the side walls of said trough upon the conveying of hotmaterials along said liner trough, said heat shield comprising aplurality of longitudinally aligned heat barriers extending for thelength of said underlying trough in the space beneath the bottom of saidliner trough, each heat barrier comprising a plurality of layers of thinheat radiating sheets, each sheet having uniformly spaced dimpledportions forming projections projecting from the bottoms thereof andgenerally spacing said sheets apart and from the top surface of thebottom of said underlying trough, each upper sheet being longitudinallyolset along the next adjacent lower sheet to position the projectingportions of the dimpled portions of said sheets to engage the planesurfaces of the top surface of the said sheets and of bottom of theunderlyingtrough, said sheets being Welded together at spaced points andto the top surface of the bottom of said underlying trough adjacent thelongitudinal margins of one barrier lapping the upwardly facing endportions ofthe sheets of the next adjacent barrier to provide a gen.erally plane top surface for said barriers in the space between thebottom of said linertroughs and the top s urface of the bottom of saidunderlying trough and generally out of contact therewith. Y

References Cited by the Examiner UNITED STATES PATENTS 11/39. r imme1 TV- 1 65-134X 6/60 Walpole.

SAMUEL F. COLEMAN, Primary Examiner.

of said sheets, and the projecting end portions of the sheets 15 EDWARDA. SROKA,`Examine1-.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3, 191763 June 29, 1965 Loy D. Hagenbook It is hereby certified that errorappears in the above numbered patent requiring correction and that thesaid Letters Patent should read as corrected below.

Column l, line 40, for "result" read resultant column 7, line 11, after"surfaces" insert of said sheets and same line ll strike out "saidsheets and of" Signed and sealed this 1st day of February 1966.

(SEAL) Attest:

ERNEST W. SWIDER EDWARD I. BRENNER Attesting Officer Commissioner ofPatents

1. IN A SHAKER CONVEYOR TROUGH LINE, AN UNDERLYING TROUGH EXTENDING FORTHE LENGTH OF THE TROUGH LINE, A LINER TROUGH NESTED WITHIN AND HAVING ABOTTOM SPACED ABOVE THE TOP SURFACE OR THE BOTTOM OF SAID UNDERLYINGTROUGH, A HEAT SHIELD BETWEEN SAID LINER TROUGH AND SAID UNDERLYINGTROUGH, SAID HEAT SHIELD COMPRISING A LAYER OF THIN HEAT RADIATING SHEETMATERIAL EXTENDING ALONG AND SPACED BETWEEN THE BOTTOM OF SAID LINERTROUGH AND THE TOP SURFACE OF THE BOTTOM OF SAID UNDERLYING TROUGH.